Update D LSP Server
The dls is no longer maintained (https://github.com/d-language-server/dls#this-project-is-unmaintained-please-use-another-one-such-as-serve-d), anyone in community D would now use serve-d (https://github.com/Pure-D/serve-d).
The dls is no longer maintained (https://github.com/d-language-server/dls#this-project-is-unmaintained-please-use-another-one-such-as-serve-d), anyone in community D would now use serve-d (https://github.com/Pure-D/serve-d).